Battery monomer, battery and electric device
By designing the tabs in the battery cells to be misaligned and staggered along their central axis, the problem of poor welding was solved, and the current carrying capacity and safety performance of the battery cells were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BATTEROTECH CO LTD
- Filing Date
- 2025-04-21
- Publication Date
- 2026-05-05
AI Technical Summary
Existing ultrasonic welding technology is prone to poor welding and incomplete welding when welding the tabs of high-energy-density battery cells. This results in weak overcurrent capacity of the tabs, local temperature rise and high internal impedance, which affects the cycle life and safety performance of the battery.
The battery cell structure is designed such that the central axes of the first and second tab groups are misaligned with the central axes of the corresponding electrode components along their length, and are also offset along the thickness direction of the battery cell. This ensures that the orthogonal projections of the tab groups in the thickness direction do not overlap, so that they can be welded to the terminals or adapter plates.
It reduces the possibility of poor soldering and missing soldering, improves the overcurrent capacity of the tabs, reduces local temperature rise and internal impedance, extends the cycle life of battery cells, and improves safety performance.
Smart Images
Figure CN224204120U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, specifically to a battery cell, a battery, and an electrical device. Background Technology
[0002] With the development of new energy technologies, battery cells play a crucial role in electric vehicles, smartphones and wearable devices, and energy storage systems due to their advantages such as small size, light weight, no memory effect, and long cycle life. As technology advances and products upgrade, the requirements for the energy density and safety performance of battery cells are becoming increasingly stringent. High energy density battery cells mean a greater number of stacked or wound layers, and correspondingly, a greater number of tab layers. When the number of tab layers exceeds 60, limitations in current ultrasonic welding technology make it prone to defects such as incomplete or missed welds in thicker tab layers. This results in weak current carrying capacity of the tabs, excessively high local temperature rise, and high internal impedance, affecting the battery's cycle life and safety performance. Utility Model Content
[0003] Therefore, it is necessary to provide a battery cell, battery, and electrical device that can reduce defects such as incomplete welding and missing welding during the welding process to address the above problems.
[0004] A battery cell, the battery cell comprising a first electrode assembly and a second electrode assembly stacked together, the first electrode assembly and the second electrode assembly being stacked along the thickness direction of the battery cell;
[0005] Both the first electrode assembly and the second electrode assembly include a first tab group and a second tab group. Along the length direction of the battery cell, the first tab group and the second tab group are located at opposite ends of the corresponding electrode assembly. In the same electrode assembly, the central axis of at least one of the first tab group and the second tab group is misaligned with the central axis of the corresponding electrode assembly along its length direction.
[0006] The two sets of first tabs of the first electrode assembly and the second electrode assembly are staggered in the thickness direction of the battery cell.
[0007] In some embodiments, the orthographic projections of the two sets of first tabs of the first electrode assembly and the second electrode assembly do not overlap in the thickness direction of the battery cell.
[0008] In some embodiments, in the width direction of the battery cell, the distance between the central axis of the first tab group of the first electrode assembly and the central axis in the length direction of the first electrode assembly is deltA1, where deltA1 is less than or equal to (0.5*W - 0.5*W). 第一极耳组W is the width of the electrode assembly. 第一极耳组 The maximum width of the first electrode group;
[0009] The central axis of the first tab group of the second electrode assembly overlaps with the central axis of the second electrode assembly along its length.
[0010] In some embodiments, deltA1 is less than or equal to (0.25*W).
[0011] In some embodiments, in the width direction of the battery cell, the distance between the central axis of the first tab group of the first electrode assembly and the central axis of the first electrode assembly in the length direction is deltA1, and the distance between the central axis of the first tab group of the second electrode assembly and the central axis of the second electrode assembly in the length direction is deltA2, wherein deltA1 is less than or equal to (0.5*W - 0.5*W). 第一极耳组 And deltA2 is less than or equal to (0.5*W-0.5*W) 第一极耳组 W is the width of the electrode assembly. 第一极耳组 This is the maximum width of the first electrode group.
[0012] In some embodiments, in the width direction of the battery cell, the central axis of the first tab group of the first electrode assembly and the central axis of the first tab group of the second electrode assembly are located on both sides of the central axis in the length direction of the battery cell.
[0013] In some embodiments, the first tab group of the first electrode assembly and the first tab group of the second electrode assembly are centrally symmetrical about the central axis of the length direction of the battery cell.
[0014] In some embodiments, in the width direction of the battery cell, the distance between the central axis of the first tab group of the first electrode assembly and the central axis of the first tab group of the second electrode assembly is deltA3, wherein deltA3 is less than or equal to (WW). 第一极耳组 And greater than or equal to W 第一极耳组 Preferably, deltA3 is less than or equal to 0.5W.
[0015] A battery comprising a battery cell as described in any of the above embodiments.
[0016] An electrical device includes a battery as described in the above embodiments, the battery being used to provide electrical energy to the electrical device.
[0017] Compared with the prior art, this application has the following beneficial effects:
[0018] The aforementioned battery cell, battery, and electrical device are designed such that, in the same electrode assembly, the central axis of at least one of the first and second tab groups is misaligned with the central axis of the corresponding electrode assembly along its length. Furthermore, the two sets of first tab groups in the first and second electrode assemblies are staggered along the thickness direction of the battery cell, resulting in non-overlapping orthographic projections of the two sets of first tab groups in the thickness direction of the battery cell. In this configuration, welding the non-overlapping portions of the orthographic projections of the two sets of first tab groups in the thickness direction of the electrode assembly to the first terminal post or first adapter piece of the battery cell avoids welding defects such as incomplete or missed welds due to excessive tab layer thickness, and also reduces welding difficulty. This also ensures the current-carrying capacity of the first tab group, prevents excessive localized temperature rise in the first tab group, reduces internal impedance, and results in a longer cycle life and better safety performance for the battery cell. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the structure of a battery cell in the core-layout stage when the distance between the central axis of the first tab group of the first electrode assembly and the central axis of the length direction of the first electrode assembly is deltA1, and the central axis of the first tab group of the second electrode assembly overlaps with the central axis of the length direction of the second electrode assembly.
[0020] Figure 2 This is a schematic diagram of the structure of the first electrode assembly in another embodiment of this application;
[0021] Figure 3 This is a schematic diagram of the structure of a single cell in the core-layout stage when the distance between the central axis of the first tab group of the first electrode assembly and the central axis of the first electrode assembly along the length direction is deltA1, and the distance between the central axis of the first tab group of the second electrode assembly and the central axis of the second electrode assembly along the length direction is deltA2.
[0022] Figure 4 for Figure 3 The diagram shows a battery cell in the core assembly stage.
[0023] Figure 5 This is a schematic diagram of the structure of the second electrode assembly in another embodiment of this application;
[0024] Figure 6 This is a schematic diagram of the structure of a single battery cell in the core-layout stage when the distance between the central axis of the first tab group of the first electrode assembly and the central axis of the first electrode assembly along the length direction is deltA1, and the distance between the central axis of the first tab group of the second electrode assembly and the central axis of the second electrode assembly along the length direction is deltA2.
[0025] Figure 7 for Figure 6 The diagram shows a battery cell in the core assembly stage.
[0026] Figure 8 for Figure 1 ,or Figure 3 ,or Figure 6 The diagram shows the structure of the first electrode assembly and the second electrode assembly before welding the two sets of first tabs to the first adapter piece in the battery cell shown.
[0027] Icon labels:
[0028] 1. Battery cell;
[0029] 10. Electrode assembly; 20. First end cap; 30. Second end cap; 40. Housing; 50. First adapter plate; 60. Second adapter plate;
[0030] 10a. First electrode assembly; 10b. Second electrode assembly; 11. First electrode tab group; 111. Side edge of the first electrode tab; 112. Side edge of the second electrode tab; 12. Second electrode tab group; 13. Main body; 131. Side edge of the first main body; 132. Side edge of the second main body;
[0031] X: Length direction of the battery cell; Y: Width direction of the battery cell; Z: Thickness direction of the battery cell. Detailed Implementation
[0032] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0033] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0036] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0037] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0038] With the development of new energy technologies, battery cells play a crucial role in electric vehicles, smartphones and wearable devices, and energy storage systems due to their advantages such as small size, light weight, no memory effect, and long cycle life. As technology advances and products upgrade, the requirements for the energy density and safety performance of battery cells are becoming increasingly stringent. High energy density battery cells mean a greater number of stacked or wound layers, and correspondingly, a greater number of tab layers. When the number of tab layers exceeds 60, limitations in current ultrasonic welding technology make it prone to defects such as incomplete or missed welds in thicker tab layers. This results in weak current carrying capacity of the tabs, excessively high local temperature rise, and high internal impedance, affecting the battery's cycle life and safety performance.
[0039] Please see Figures 1 to 6 To alleviate the aforementioned problems, this application designs a battery cell 1, which includes a first electrode assembly 10a and a second electrode assembly 10b stacked together along the thickness direction Z of the battery cell 1. Both the first electrode assembly 10a and the second electrode assembly 10b include a first tab group 11 and a second tab group 12. Along the length direction X of the battery cell 1, the first tab group 11 and the second tab group 12 are located at opposite ends of the corresponding electrode assembly 10. In the same electrode assembly, the central axis of at least one of the first tab group 11 and the second tab group 12 is offset from the central axis of the corresponding electrode assembly 10 along its length direction. The two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b are offset along the thickness direction Z of the battery cell 1.
[0040] The first tab group 11 is either the positive tab group or the negative tab group, and the second tab group 12 is the other of the positive tab group and the negative tab group. A unit is formed by alternating layers of a positive electrode sheet, a separator, a negative electrode sheet, and a separator. Multiple such units are stacked to form the electrode assembly 10. Alternatively, it can be formed by alternating layers of a positive electrode sheet, a separator, a negative electrode sheet, and a separator, followed by winding. The specific configuration can be determined according to requirements. Each positive electrode sheet is led out from one side and die-cut to form a positive tab, and each negative electrode sheet is led out from one side and die-cut to form a negative tab. In the electrode assembly 10, all stacked positive tabs are welded to form a positive tab group, and all stacked negative tabs are welded to form a negative tab group. The electrode assembly 10 also includes a main body 13, which is constructed from the unleaded portions of the positive and negative electrode sheets and the separator. The positive and negative tab groups are located at both ends of the main body 13.
[0041] In battery cell 1, the first electrode assembly 10a and the second electrode assembly 10b are configured together to form an electrode assembly group. In battery cell 1, there can be one or more electrode assembly groups, which can be set according to the requirements.
[0042] The central axis of the first tab group 11 is the central axis along the length direction X of the battery cell 1. The central axis of the second tab group 12 is the central axis along the length direction X of the battery cell 1.
[0043] In the same electrode assembly, the central axis of at least one of the first tab group 11 and the second tab group 12 is misaligned with the central axis of the corresponding electrode assembly 10 along its length, for example, to Figure 1 For example, the central axis of the first tab group 11 and the second tab group 12 of the first electrode assembly 10a (the central axis of the first tab group 11 of the first electrode assembly 10a is as follows) Figure 1 As shown in L3, both are aligned with the central axis of the first electrode assembly 10a along its length (e.g., ...). Figure 1 As shown in L1, the first electrode group 11 of the second electrode assembly 10b is misaligned, and at the same time, the central axis of the first electrode group 11 of the second electrode assembly 10b (as shown in L1) is misaligned. Figure 1 As shown in L4) and the central axis along the length direction of the second electrode assembly 10b (as shown in L4) Figure 1 (As shown in L2) overlaps, but the central axis of the second electrode assembly 10b's second tab group 12 is misaligned with the central axis of the second electrode assembly 10b's length direction.
[0044] For example, with Figure 3 For example, the central axis of the first electrode assembly 10a, the first tab group 11 (such as...) Figure 3 As shown in L3, the axis of the first electrode assembly 10a along its length is (e.g., L3) and the axis of the first electrode assembly 10a along its length. Figure 3 As shown in L1, the central axis of the second tab group 12 of the first electrode assembly 10a overlaps with the central axis of the first electrode assembly 10a along its length. Simultaneously, the central axis of the first tab group 11 of the second electrode assembly 10b (as shown in L1) is misaligned. Figure 3 As shown in L4) and the central axis along the length direction of the second electrode assembly 10b (as shown in L4) Figure 3 (As shown in L2) It is misaligned, but the central axis of the second tab group 12 of the second electrode assembly 10b overlaps with the central axis of the second electrode assembly 10b in the length direction.
[0045] For example, with Figure 6 For example, the central axes of the first tab group 11 and the second tab group 12 of the first electrode assembly 10a are both misaligned with the central axis of the first electrode assembly 10a along its length (e.g., the central axis of the first tab group 11 of the first electrode assembly 10a is misaligned with the central axis of the first electrode assembly 10a along its length). Figure 6 As shown in L3, the central axis of the first electrode assembly 10a along its length is as follows: Figure 6As shown in L1), and the central axis of the first tab group 11 and the second tab group 12 of the second electrode assembly 10b is misaligned with the central axis of the second electrode assembly 10b along its length (as shown in L1). Figure 6 As shown in L4, the central axis of the second electrode assembly 10b along its length is as follows: Figure 6 (As shown in L2).
[0046] In this application, by designing at least one of the first tab group 11 and the second tab group 12 in the same electrode assembly to be misaligned with the central axis of the corresponding electrode assembly 10 along its length, and by staggering the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b along the thickness direction Z of the battery cell 1, the orthographic projections of the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b along the thickness direction Z of the battery cell 1 do not overlap. In this case, welding the non-overlapping portions of the orthographic projections of the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b along the thickness direction of the electrode assembly 10 to the first electrode post or the first adapter piece 50 of the battery cell 1 avoids welding defects such as incomplete soldering or missing soldering due to excessively thick tab layers, and also reduces the welding difficulty. In this way, the overcurrent capacity of the first tab group 11 can be guaranteed, the local temperature rise of the first tab group 11 will not be too high, the internal impedance is small, and the battery cell 1 has a long cycle life and safety performance.
[0047] Specifically, when the battery cell 1 has a first terminal and a second terminal, but does not have a first adapter piece 50 and a second adapter piece 60, the first tab group 11 is welded to the first terminal, and the second tab group 12 is welded to the second terminal; when the battery cell 1 has a first terminal, a second terminal, a first adapter piece 50 and a second adapter piece 60, the first adapter piece 50 is welded to the first tab group 11 and the first terminal, and the second adapter piece 60 is welded to the second tab group 12 and the second terminal.
[0048] When the first tab group 11 is the positive tab group and the second tab group 12 is the negative tab group, the first terminal is the positive terminal, the second terminal is the negative terminal, the first adapter piece 50 is the positive adapter piece, and the second adapter piece 60 is the negative adapter piece. When the first tab group 11 is the negative tab group and the second tab group 12 is the positive tab group, the first terminal is the negative terminal, the second terminal is the positive terminal, the first adapter piece 50 is the negative adapter piece, and the second adapter piece 60 is the positive adapter piece.
[0049] In some embodiments, in the thickness direction Z of the battery cell 1, the orthographic projections of the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b do not overlap, that is, the orthographic projections of the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b do not intersect.
[0050] In this way, the non-overlapping portions of the first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b in the thickness direction of the electrode assembly 10 have a large welding area when welded to the first pole post or the first adapter piece 50 of the battery cell 1, resulting in a strong weld and a low probability of defects such as incomplete or missing welds.
[0051] Please see Figure 1 In some embodiments, in the width direction Y of the battery cell 1, the central axis of the first tab group 11 of the first electrode assembly 10a (e.g., ...) Figure 1 As shown in L3, the axis of the first electrode assembly 10a along its length is (e.g., L3) and the axis of the first electrode assembly 10a along its length. Figure 1 The spacing (as shown in L1) is deltA1, where deltA1 is less than or equal to 0.5*W - 0.5*W. 第一极耳组 W is the width of electrode assembly 10. 第一极耳组 The maximum width of the first electrode group 11; the central axis of the first electrode group 11 of the second electrode assembly 10b (e.g., Figure 1 As shown in L4) and the central axis along the length direction of the second electrode assembly 10b (as shown in L4) Figure 1 (As shown in L2) Overlap. That is, in this embodiment, the central axis of the first tab group 11 of the first electrode assembly 10a is misaligned with the central axis of the length direction of the first electrode assembly 10a, while the central axis of the first tab group 11 of the second electrode assembly 10b overlaps with the central axis of the length direction of the second electrode assembly 10b, so as to achieve the staggered arrangement of the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b.
[0052] In this embodiment, the central axis of the second tab group 12 of the first electrode assembly 10a may be misaligned with the central axis of the first electrode assembly 10a in the length direction (at this time, the central axis of the first tab group 11 and the central axis of the second tab group 12 of the first electrode assembly 10a may be located on the same side or opposite sides of the central axis of the first electrode assembly 10a in the length direction) or overlapped, and the central axis of the second tab group 12 of the second electrode assembly 10b is misaligned with the central axis of the second electrode assembly 10b in the length direction.
[0053] Specifically, the main body 13 of the electrode assembly 10 has a first main body side edge 131 and a second main body side edge 132 disposed opposite to each other along the width direction Y of the battery cell 1, and the distance between the first main body side edge 131 and the second main body side edge 132 is W.
[0054] When the central axis of the first tab group 11 of the first electrode assembly 10a is misaligned with the central axis of the first electrode assembly 10a in the length direction, and the central axis of the first tab group 11 of the second electrode assembly 10b overlaps with the central axis of the second electrode assembly 10b in the length direction, the central axis of the first tab group 11 of the first electrode assembly 10a is close to the first body side edge 131 of the first electrode assembly 10a.
[0055] In this embodiment, the first tab assembly 11 has a first surface facing the corresponding body 13. The first surface of the first tab assembly 11 has a first tab side edge 111 and a second tab side edge 112 disposed opposite to each other in the width direction Y of the battery cell 1. The distance between the first tab side edge 111 and the second tab side edge 112 is W. 第一极耳组 .
[0056] In the first electrode assembly 10a, the first tab side edge 111 is farther away from the central axis of the first electrode assembly 10a in the length direction relative to the second tab side edge 12, and the first tab side edge 111 is closer to the first body side edge 131 relative to the second tab side edge 12. In the second electrode assembly 10b, the distances from the first tab side edge 111 and the second tab side edge 12 to the central axis of the second electrode assembly 10b in the length direction are equal, and the first tab side edge 111 is closer to the first body side edge 131 relative to the second tab side edge 12.
[0057] When deltA1 equals 0.5*W - 0.5*W 第一极耳组 At this time, the distance between the central axis of the first tab group 11 of the first electrode assembly 10a and the central axis of the length direction of the first electrode assembly 10a is the largest. At this time, the first tab side edge 111 of the first tab group 11 in the first electrode assembly 10a coincides with the first body side edge 131 of the first electrode assembly 10a. The second tab side edge 112 of the first tab group 11 in the first electrode assembly 10a is located between the first body side edge 131 of the first electrode assembly 10a and the central axis of the length direction of the first electrode assembly 10a.
[0058] When deltA1 is less than (0.5*W-0.5*W) 第一极耳组 When the first electrode assembly 10a is in the first electrode assembly 10a, the first electrode tab side edge 111 of the first electrode tab group 11 is located between the first body side edge 131 of the first electrode assembly 10a and the central axis of the first electrode assembly 10a in the length direction, and the second electrode tab side edge 112 of the first electrode assembly 10a is located between the first body side edge 131 of the first electrode assembly 10a and the central axis of the first electrode assembly 10a in the length direction, or between the central axis of the first electrode assembly 10a in the length direction and the second body side edge 132 of the first electrode assembly 10a.
[0059] In this embodiment, the distance between the central axis of the first tab group 11 of the first electrode assembly 10a and the central axis of the first electrode assembly 10a along its length is designed to be deltA1, where deltA1 is less than or equal to (0.5*W - 0.5*W). 第一极耳组 W is the width of the electrode assembly. 第一极耳组 The maximum width of the first tab group 11 is given. The central axis of the first tab group 11 of the second electrode assembly 10b overlaps with the central axis of the length direction of the second electrode assembly 10b. Under the premise of being able to satisfy the requirement that the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b are staggered in the thickness direction Z of the battery cell to reduce the defects of incomplete welding and missing welding during the welding process, the compactness of the layout of the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b can also be improved. In this way, the first pole post or the first adapter piece 50 welded to the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b can also be designed with a smaller size in the width direction Y of the battery cell 1, thereby facilitating the reduction of the manufacturing cost of the battery cell 1 and making it easier to lay out other components in the width direction Y of the battery cell 1.
[0060] Furthermore, in some embodiments, deltA1 is less than or equal to (0.25*W). This design allows the first tab group 11 of the first electrode assembly 10a to be close to the central axis of the first electrode assembly 10a in the width direction Y of the battery cell 1. In this case, contact between the first tab group 11 and the housing 40 of the battery cell 1 can be avoided, improving the safety of the battery cell 1 in use. In addition, under this design, the size of the first terminal post or the first adapter piece 50 in the width direction of the battery cell 1 is further reduced, thereby further reducing the manufacturing cost of the battery cell 1, reducing the overcurrent length, reducing the internal resistance, and also facilitating the layout of other components in the width direction Y of the battery cell 1.
[0061] Please refer to the following: Figures 2 to 7 In some embodiments, in the width direction Y of the battery cell 1, the distance between the central axis of the first tab group 11 of the first electrode assembly 10a and the central axis of the length direction of the first electrode assembly 10a is deltA1, and the distance between the central axis of the first tab group 11 of the second electrode assembly 10b and the central axis of the length direction of the second electrode assembly 10b is deltA2, where deltA1 is less than or equal to (0.5*W - 0.5*W). 第一极耳组 And deltA2 is less than or equal to (0.5*W-0.5*W). 第一极耳组 W is the width of electrode assembly 10. 第一极耳组This is the maximum width of the first tab group 11. In this embodiment, the central axis of the first tab group 11 of the first electrode assembly 10a is misaligned with the central axis of the length direction of the first electrode assembly 10a, and the central axis of the first tab group 11 of the second electrode assembly 10b is also misaligned with the central axis of the length direction of the second electrode assembly 10b, so that the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b are staggered.
[0062] In this embodiment, the central axis of the second tab group 12 of the first electrode assembly 10a may be misaligned with the central axis of the first electrode assembly 10a in the length direction (at this time, the central axis of the first tab group 11 and the central axis of the second tab group 12 of the first electrode assembly 10a may be located on the same side or opposite sides of the central axis of the first electrode assembly 10a in the length direction) or overlapped, and the central axis of the second tab group 12 of the second electrode assembly 10b may be misaligned with the central axis of the second electrode assembly 10b in the length direction (at this time, the central axis of the first tab group 11 and the central axis of the second tab group 12 of the second electrode assembly 10b may be located on the same side or opposite sides of the central axis of the second electrode assembly 10b in the length direction) or overlapped.
[0063] Furthermore, in this embodiment, in the width direction Y of the battery cell 1, the central axis of the two sets of first electrode tabs 11 of the first electrode assembly 10a and the second electrode assembly 10b can be located on the central axis of the length direction X of the battery cell 1 (e.g., ...). Figure 4 and Figure 7 (As shown in L5) on the same side or opposite sides. For ease of explanation, the following embodiments are all described with the central axes of the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b located on opposite sides of the central axis of the length direction X of the battery cell 1.
[0064] Specifically, the central axis of the battery cell 1 along its length direction X is the central axis of the battery cell 1, and there is one and only one such axis in the battery cell 1. The central axis of the first electrode assembly 10a along its length direction and the central axis of the second electrode assembly 10b along its length direction X are both central axes of the electrode assemblies along their own length direction (which is consistent with the length direction X of the battery cell 1). Each electrode assembly has its own corresponding central axis along its own length direction, and the central axes along their own length directions are different for electrode assemblies located at different positions in the thickness direction of the battery cell 1.
[0065] In this embodiment, for ease of explanation, the following embodiments will be described with the central axes of the two sets of first tabs 11 of the first electrode assembly 10a and the second electrode assembly 10b located on opposite sides of the central axis of the length direction X of the battery cell 1.
[0066] Furthermore, in this embodiment, in the first electrode assembly 10a, the first tab side edge 111 is located away from the central axis of the length direction of the first electrode assembly 10a relative to the second tab side edge 12, and the first tab side edge 111 is located closer to the first body side edge 131 relative to the second tab side edge 12. In the second electrode assembly 10b, the first tab side edge 111 is located away from the central axis of the length direction of the second electrode assembly 10b relative to the second tab side edge 12, and the first tab side edge 111 is located closer to the second body side edge 132 relative to the second tab side edge 12.
[0067] When deltA1 and deltA2 equal 0.5*W - 0.5*W 第一极耳组 At this time, the distance between the central axis of the first tab group 11 of the first electrode assembly 10a and the central axis of the second tab group 12 of the second electrode assembly 10b is the largest. At this time, the first tab side edge 111 of the first tab group 11 in the first electrode assembly 10a coincides with the first body side edge 131 of the first electrode assembly 10a, and the first tab side edge 111 of the first tab group 11 in the second electrode assembly 10b coincides with the second body side edge 132 of the second electrode assembly 10b.
[0068] When deltA1 and deltA2 are both less than (0.5*W-0.5*W) 第一极耳组 When the first electrode assembly 10a has a first electrode tab side edge 111 of the first electrode tab group 11 located between the first body side edge 131 of the first electrode assembly 10a and the central axis of the first electrode assembly 10a in the length direction, the first electrode tab side edge 111 of the first electrode tab group 11 in the second electrode assembly 10b is located between the second body side edge 132 of the second electrode assembly 10b and the central axis of the second electrode assembly 10b in the length direction.
[0069] In this embodiment, deltA1 is designed to be less than or equal to (0.5*W - 0.5*W). 第一极耳组 And deltA2 is less than or equal to (0.5*W-0.5*W). 第一极耳组 This allows the two sets of first tabs 11 of the first electrode assembly 10a and the second electrode assembly 10b to be flexibly distributed in the width direction of the battery cell 1 according to the structure of the battery cell 1. While ensuring that the two sets of first tabs 11 of the first electrode assembly 10a and the second electrode assembly 10b are staggered to reduce defects such as incomplete welding or missing welding during the welding process, it can also improve the layout flexibility of the two sets of first tabs 11 of the first electrode assembly 10a and the second electrode assembly 10b.
[0070] Furthermore, deltA1 and deltA2 are both less than or equal to (0.25*W). This design allows both sets of first tabs 11 of the first electrode assembly 10a and the second electrode assembly 10b to be close to the central axis of the corresponding electrode assembly 10 along its length. In this case, the two sets of first tabs 11 of the first electrode assembly 10a and the second electrode assembly 10b can be prevented from contacting the casing 40 of the battery cell 1, thus improving the safety of using the battery cell 1.
[0071] Please see Figures 3 to 7 In some embodiments, in the width direction Y of the battery cell 1, the central axis of the first tab group 11 of the first electrode assembly 10a and the central axis of the first tab group 11 of the second electrode assembly 10b are located on both sides of the central axis of the length direction X of the battery cell 1.
[0072] In this way, the space for the first tab group 11 of the first electrode assembly 10a and the first tab group 11 of the second electrode assembly 10b to be staggered in the width direction Y of the battery cell 1 is larger, which makes the staggered range of the first tab group 11 of the first electrode assembly 10a and the first tab group 11 of the second electrode assembly 10b larger. Consequently, the overlapping portion of the first tab group 11 of the first electrode assembly 10a and the first tab group 11 of the second electrode assembly 10b in the thickness direction of the battery cell 1 is less, thereby further reducing the possibility of stacking and welding the staggered first tab group 11 during welding and improving the welding effect.
[0073] In some embodiments, the first tab group 11 of the first electrode assembly 10a and the first tab group 11 of the second electrode assembly 10b are centrally symmetrical about the central axis of the length direction X of the battery cell 1.
[0074] In this way, the two sets of first electrode tabs 11 of the first electrode assembly 10a and the second electrode assembly 10b are evenly distributed on both sides of the central axis of the length direction X of the battery cell 1, with the central axis of the length direction X as the boundary, and are welded to one of the first electrode post and the first adapter piece 50, which helps to improve the uniformity and reliability of the welding.
[0075] Please see Figure 3 and Figure 6 In some embodiments, in the width direction Y of the battery cell 1, the central axis of the first tab group 11 of the first electrode assembly 10a (e.g., ...) Figure 3 and Figure 6 (as shown in L3) and the central axis of the first tab group 11 of the second electrode assembly 10b (as shown in L3) Figure 3 and Figure 6 The spacing (as shown in L4) is deltA3, and deltA3 is less than or equal to (WW). 第一极耳组 And greater than or equal to W 第一极耳组Preferably, deltA3 is less than or equal to 0.5W.
[0076] deltA3 equals (WW) 第一极耳组 When the battery cell is in operation, the first tab group 11 of the first electrode assembly 10a and the first tab group 11 of the second electrode assembly 10b are spaced apart in the width direction Y of the battery cell 1. At this time, the first tab side edge 111 of the first electrode assembly 10a coincides with the first body side edge 131 of the first electrode assembly 10a, and the first tab side edge 111 of the second electrode assembly 10b coincides with the second body side edge 132 of the second electrode assembly 10b.
[0077] deltA3 equals W 第一极耳组 At this time, the first tab group 11 of the first electrode assembly 10a and the first tab group 11 of the second electrode assembly 10b are arranged with zero spacing in the width direction Y of the battery cell 1. At this time, the second tab side edge 12 of the first electrode assembly 10a is in contact with the central axis of the first electrode assembly 10a in the length direction, and the second tab side edge 12 of the second electrode assembly 10b is in contact with the central axis of the second electrode assembly 10b in the length direction.
[0078] When deltA3 equals 0.5W, the first tab group 11 of the first electrode assembly 10a and the first tab group 11 of the second electrode assembly 10b are spaced apart in the width direction Y of the battery cell 1. At this time, the first tab group 11 of the first electrode assembly 10a is located between the first main body side edge 131 of the first electrode assembly 10a and the central axis of the first electrode assembly 10a in the length direction, and the first tab group 11 of the second electrode assembly 10b is located between the second main body side edge 132 of the second electrode assembly 10b and the central axis of the second electrode assembly 10b in the length direction.
[0079] In this embodiment, deltA3 is less than or equal to (WW) 第一极耳组 And greater than or equal to W 第一极耳组At the same time, while ensuring that the two first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b are staggered to reduce the possibility of incomplete welding or missing welding and improve the welding effect, it also allows the two first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10 to have a large layout space in the width direction of the battery cell, which can be flexibly arranged according to the structure of the battery cell 1. When deltA3 is less than or equal to 0.5W, the distance between the two first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b is small. In this way, the size of the first pole post or the first adapter piece 50 welded to the two first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b in the width direction Y of the battery cell 1 can also be reduced, thereby further reducing the manufacturing cost of the battery cell 1 and facilitating the layout of other components in the width direction Y of the battery cell 1.
[0080] In some embodiments, during high-current fast charging, such as when the charging current rate exceeds 2C, the orthographic projections of the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b do not overlap in the thickness direction Z of the battery cell 1, that is, the orthographic projections of the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b do not intersect. For this stacked electrode assembly, a completely staggered design is adopted, and the center distance between the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b is D in the width direction Y of the battery cell 1. full The two sets of first electrode tabs 11 of the first electrode assembly 10a and the second electrode assembly 10b are completely identical.
[0081] D full It lies between its maximum value Dfull_max and its minimum value Dfull_min.
[0082] The minimum value Dfull_min is W 第一极耳组 +S, where W 第一极耳组 S is the maximum width of the first electrode lug group 11, and S is the safe distance of the welding heat-affected zone, for example, 1 to 2 mm for laser welding.
[0083] The maximum value Dfull_max is related to three factors: the coverage capability of the first adapter piece 50, the uniformity of the current path, and the mechanical strength and vibration reliability.
[0084] 1. Dfull_max is limited by the width of the first adapter plate (C). W It is necessary to ensure that the first adapter piece 50 can completely cover the welding areas of the two first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b; the width of the first adapter piece 50 (C WThis refers to the dimension of the first adapter piece 50 in the width direction Y of the battery cell 1.
[0085] D full_max1 ≤C W -W 第一极耳组 -2Sedge, where C W The first adapter plate is 50mm wide, for example, 15mm; W 第一极耳组 : Maximum width of the first tab group 11; Sedge: Safety margin at the edge of the first adapter piece 50 to prevent poor edge contact, usually 1mm to 2mm.
[0086] 2. Current path uniformity: Excessive misalignment will lead to a longer current path, increasing resistance and localized heating.
[0087] D full_max2 ≤(ΔR allow ·A cu ) / (ρ·L path )
[0088] ΔR allow The allowed increase in resistance is, for example, no more than 5% of the total internal resistance;
[0089] A cu : Cross-sectional area of the first adapter piece 50 (thickness of the first adapter piece 50 × width of the first adapter piece 50);
[0090] ρ: Resistivity of the material of the first adapter plate (50);
[0091] L path The additional current path length caused by misalignment, and D full_max2 A linear relationship, for example,
[0092] Take K path ·D full_max2 For example, coefficient K path ≈1.2.
[0093] Mechanical strength and vibration reliability: Excessive misalignment will reduce the structural stiffness of the first adapter piece 50, and it must meet the requirements for vibration fatigue resistance.
[0094]
[0095] E: Elastic modulus of the material of the first adapter piece 50, for example: 120 GPa for copper;
[0096] I: Moment of inertia of the first adapter plate at section 50;
[0097] F: Vibration load, for example, a typical value F = 50 N;
[0098] L: Cantilever length, approximately D full_max3 .
[0099] Considering the coverage capability, current path uniformity, mechanical strength, and vibration reliability of the first adapter piece 50, the center distance D full The maximum value D full _max takes the minimum value of the above constraint results:
[0100] D full_max =min(D full_max1 D full_max2 D full_max3 ).
[0101] In some embodiments, under non-fast charging scenarios, such as under normal charging current conditions, the central axis of at least one of the first tab group 11 and the second tab group 12 is misaligned with the central axis of the corresponding electrode assembly 10 in the length direction, and the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b are staggered in the thickness direction Z of the battery cell 1, so that the orthographic projections of the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b in the thickness direction Z of the battery cell 1 have a non-overlapping part. In this case, the orthographic projections of the two sets of first tab groups 11 in the thickness direction Z of the battery cell 1 can have a certain degree of overlap. In the width direction Y of the battery cell 1, the center distance between the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b is D2. The upper and lower limits of D2 need to comprehensively balance electrical performance, welding reliability and structural stability. D2 is located between its maximum value D2max and minimum value D2min.
[0102] The minimum value of D2, D2min, is related to the following factors:
[0103] 1. Minimum contact area requirement: Ensure that the effective contact area of the first electrode group 11 and the first adapter piece 50 meets the non-fast charging current requirement;
[0104] in,
[0105] I max : The maximum operating current in non-fast charging scenarios, such as the current corresponding to 1C rate;
[0106] J allow Permissible current density, such as 2A-3A / mm² for copper. 2 ;
[0107] C w The first adapter plate is 50mm wide.
[0108] W 第一极耳组 : is the maximum width of the first electrode group 11.
[0109] 2. Weld heat-affected zone (HAZ) isolation: to prevent the accumulation of welding heat that could lead to incomplete welds; D2 min ≥2·HAZ
[0110] in,
[0111] HAZ: Diameter of the heat-affected zone during welding, such as 1-1.5mm for laser welding.
[0112] Considering the minimum contact area requirements of the first tab assembly 11 and the first adapter piece 50, and the isolation of the welding heat-affected zone (HAZ), the minimum value of the center distance D2 is D2. min Take the maximum value of the above constraint results:
[0113] D2 min =max(D2) min1 D2 min2 On the other hand, the maximum value of the center distance D2 is D2 max It is related to the following factors:
[0114] 1. Coverage capability of the first adapter piece 50: Ensure that the first adapter piece 50 completely covers the misaligned areas of the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b;
[0115] D2 max1 ≤C w -W 第一极耳组 -2·S edge
[0116] in,
[0117] C w The first adapter plate is 50mm wide.
[0118] S edee The first adapter piece has a 50mm edge safety margin, for example, 1mm.
[0119] W 第一极耳组 : The maximum width of the first electrode group 11.
[0120] 2. Mechanical strength limitations: Avoid excessive cantilever length leading to vibration fatigue fracture;
[0121]
[0122] in,
[0123] E: Elastic modulus of the material of the first adapter piece 50, for example, copper is 120 GPa;
[0124] I: Moment of inertia of the first adapter plate at section 50. C T The thickness of the first adapter piece is 50 mm.
[0125] F: Vibration load, for example, 50N;
[0126] L pat : Current path length, relative to D2 max2 Relevant, take K path ·D2 max2 coefficient K path ≈1.2;
[0127] 3. Resistance increment control: An excessively long misalignment path will increase resistance and temperature rise.
[0128]
[0129] in,
[0130] ΔR allow Allowed resistance increment, for example, 3% of the total internal resistance;
[0131] A cu The first adapter piece has a cross-sectional area of 50, for example, C. w ·C T ;
[0132] ρ: Resistivity of the material of the first adapter piece 50, for example, copper is 1.68*10. -8 Ω·m;
[0133] L path : Current path length, relative to D2 max3 Relevant, take K path ·D2 max3 coefficient K path ≈1.2; Considering the three factors of the first adapter piece 50's coverage capability, mechanical strength limitations, and resistance increment control, the maximum value of the center distance D2 is D2. max Take the minimum value of the above constraint results:
[0134] D2 max =min(D2) max1 D2 max2 D2 max3 )
[0135] Please see Figures 1 to 8 The assembly process of the battery cell 1 in one embodiment of the application will be described in detail below. Before that, it is necessary to briefly introduce the other structures of the battery cell 1, specifically the housing 40, the first end cap 20, and the second end cap 30.
[0136] The assembly process of the battery cell 1 includes a core-laying stage and a core-combining stage. In the core-laying stage, the first electrode assembly 10a and the second electrode assembly 10b are respectively arranged on opposite sides of the first end cover 20 along the length direction of the electrode assembly 10, and the width direction of the first end cover 20 coincides with the length direction of the electrode assembly 10.
[0137] like Figure 1 As shown, in an embodiment where the central axis of the first tab group 11 of the first electrode assembly 10a is misaligned with the central axis of the first electrode assembly 10a along its length, and the central axis of the first tab group 11 of the second electrode assembly 10b overlaps with the central axis of the second electrode assembly 10b along its length, the two second tab groups 12 of the first electrode assembly 10a and the second electrode assembly 10b are misaligned along the width direction Y of the battery cell 1. Then, the two second tab groups 12 of the first electrode assembly 10a and the second electrode assembly 10b are respectively welded to the second adapter piece 60 to fix the second adapter piece 60 and the two sets of second tab groups 12 of the first electrode assembly 10a and the second electrode assembly 10b.
[0138] like Figure 3 and Figure 6 As shown, in an embodiment where the central axis of the first tab group 11 of the first electrode assembly 10a is misaligned with the central axis of the first electrode assembly 10a along its length, and the central axis of the first tab group 11 of the second electrode assembly 10b is also misaligned with the central axis of the second electrode assembly 10b along its length, and the central axis of the first tab group 11 of the first electrode assembly 10a and the central axis of the first tab group 11 of the second electrode assembly 10b are located on opposite sides of the central axis of the battery cell 1 along its length X, the first electrode assembly 10a and the second electrode group 10b are first placed on... The two second tab groups 12 of component 10b are partially overlapped on the second adapter piece 60 along the length direction of the electrode assembly 10. Alternatively, the two second tab groups 12 of the first electrode assembly 10a and the second electrode assembly 10b are first misaligned along the width direction Y of the battery cell 1, and then the non-overlapping portions of the two second tab groups 12 projected in the thickness direction Z of the battery cell 1 are welded to the second adapter piece 60 to fix the second adapter piece 60 and the two second tab groups 12 of the first electrode assembly 10a and the second electrode assembly 10b.
[0139] like Figure 1 , Figure 3 and Figure 4 , Figures 6 to 8As shown, after fixing the second adapter plate 60 and the two sets of second tabs 12 of the first electrode assembly 10a and the second electrode assembly 10b, the first electrode assembly 10a and the second electrode assembly 10b are stacked and the assembly enters the core assembly stage. In this stage, the first end cap 20 seals one opening of the housing 40, the first electrode assembly 10a and the second electrode assembly 10b are installed into the housing 40, and the two sets of first tabs 11 of the first electrode assembly 10a and the second electrode assembly 10b extend out from the other opening of the housing 40. Then, the non-overlapping portions of the two sets of first tabs 11 of the first electrode assembly 10a and the second electrode assembly 10b projected in the thickness direction Z of the battery cell 1 are welded to the first adapter plate 50 to fix the first adapter plate 50 and the two sets of first tabs 11 of the first electrode assembly 10a and the second electrode assembly 10b. Finally, the second end cap 30 closes the other opening of the housing 40, and the assembly of the battery cell 1 is completed.
[0140] This application also provides a battery, which includes a battery cell 1 as described in any of the above embodiments. The battery in this application has the effects of any of the above embodiments, and therefore will not be described again here.
[0141] This application also provides an electrical device comprising a battery as described in any of the foregoing embodiments, the battery being used to provide electrical energy to the electrical device. The electrical device in this application has the effects of any of the foregoing embodiments, and therefore will not be described further here.
[0142] The electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.
[0143] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical devices described above.
[0144] The aforementioned battery cell 1, battery, and electrical device are designed such that, in the same electrode assembly, the central axis of at least one of the first tab group 11 and the second tab group 12 is misaligned with the central axis of the corresponding electrode assembly 10 along its length. Furthermore, the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b are staggered along the thickness direction Z of the battery cell 1, resulting in non-overlapping orthogonal projections of the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b along the thickness direction Z of the battery cell 1. In this case, welding the non-overlapping portions of the orthogonal projections of the two sets of first tab groups 11 of the first electrode assembly 10a and the second electrode assembly 10b to the first terminal post or the first adapter piece 50 of the battery cell 1 avoids welding defects such as incomplete soldering or missed soldering due to excessively thick tab layers, and also reduces the difficulty of welding. In this way, the overcurrent capacity of the first tab group 11 can be guaranteed, the local temperature rise of the first tab group 11 will not be too high, the internal impedance is small, and the battery cell 1 has a long cycle life and safety performance.
[0145] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0146] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A battery cell, characterized in that, The battery cell includes a first electrode assembly (10a) and a second electrode assembly (10b) stacked together, the first electrode assembly (10a) and the second electrode assembly (10b) being stacked along the thickness direction (Z) of the battery cell; Both the first electrode assembly (10a) and the second electrode assembly (10b) include a first tab group (11) and a second tab group (12). Along the length direction (X) of the battery cell, the first tab group (11) and the second tab group (12) are located at opposite ends of the corresponding electrode assembly (10). In the same electrode assembly, the central axis of at least one of the first tab group (11) and the second tab group (12) is misaligned with the central axis of the corresponding electrode assembly (10) along its length direction. The two sets of first tabs (11) of the first electrode assembly (10a) and the second electrode assembly (10b) are staggered in the thickness direction (Z) of the battery cell.
2. The battery cell according to claim 1, characterized in that, In the thickness direction (Z) of the battery cell, the orthographic projections of the two sets of first tabs (11) of the first electrode assembly (10a) and the second electrode assembly (10b) do not overlap.
3. The battery cell according to claim 2, characterized in that, In the width direction (Y) of the battery cell, the distance between the central axis of the first tab group (11) of the first electrode assembly (10a) and the central axis of the length direction of the first electrode assembly (10a) is deltA1, where deltA1 is less than or equal to (0.5*W - 0.5*W). 第一极耳组 W is the width of the electrode assembly (10). 第一极耳组 The maximum width of the first electrode group (11); The central axis of the first tab group (11) of the second electrode assembly (10b) overlaps with the central axis of the second electrode assembly (10b) in the length direction.
4. The battery cell according to claim 3, characterized in that, The deltA1 is less than or equal to (0.25*W).
5. The battery cell according to claim 2, characterized in that, In the width direction (Y) of the battery cell, the distance between the central axis of the first tab group (11) of the first electrode assembly (10a) and the central axis of the length direction of the first electrode assembly (10a) is deltA1, and the distance between the central axis of the first tab group (11) of the second electrode assembly (10b) and the central axis of the length direction of the second electrode assembly (10b) is deltA2, wherein deltA1 is less than or equal to (0.5*W - 0.5*W). 第一极耳组 And deltA2 is less than or equal to (0.5*W-0.5*W). 第一极耳组 W is the width of the electrode assembly (10). 第一极耳组 The maximum width of the first tab group (11) is given.
6. The battery cell according to claim 5, characterized in that, In the width direction (Y) of the battery cell, the central axis of the first tab group (11) of the first electrode assembly (10a) and the central axis of the first tab group (11) of the second electrode assembly (10b) are located on both sides of the central axis in the length direction (X) of the battery cell.
7. The battery cell according to claim 6, characterized in that, The first tab group (11) of the first electrode assembly (10a) and the first tab group (11) of the second electrode assembly (10b) are centrally symmetrical about the central axis of the length direction (X) of the battery cell.
8. The battery cell according to claim 7, characterized in that, In the width direction (Y) of the battery cell, the distance between the central axis of the first tab group (11) of the first electrode assembly (10a) and the central axis of the first tab group (11) of the second electrode assembly (10b) is deltA3, wherein deltA3 is less than or equal to (WW). 第一极耳组 And greater than or equal to W 第一极耳组 .
9. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 8 above.
10. An electrical device, characterized in that, Includes the battery as described in claim 9 above, the battery being used to provide electrical energy to the electrical device.